Hi Al, I am pleased to assist you. This part is designed to mount onto industry-standard 5th wheel base rails, allowing trucks equipped with these rails to tow gooseneck trailers. Given your 2006 Dodge Ram 3500 Mega Cab diesel has existing 5th wheel rails with measurements of 22 inches and 10 inches center to center, your setup aligns with these industry standards. Therefore, the Curt 16055 hitch should be compatible with your current rail system. This hitch features a welded 2-5/16" trailer ball and can be positioned over the axle or flipped for a 3-inch rearward offset. Before proceeding, it's advisable to verify that your existing rails are indeed industry-standard and properly installed to ensure safety and compatibility. If you have any doubts, consulting with a professional installer can provide additional assurance. If everything checks out, click the link below to order directly and take advantage of our current discounts while supplies last. I hope this helps, and enjoy shopping! https://www.carparts.com/gooseneck-hitch/curt/cur16055?can=CPGG4850_CSQA_20250331

Hi Gene, I'm glad to assist you. No. This includes the safety chain hookups, pins, and clips, but the rails are sold separately. I hope this helps and happy shopping.

Hi Mike, I'm glad to assist you. The dimensions are as follows: The width is 13 inches. The length is 24 by 1/4 of an inch. And the height is 5 by 3/4 of an inch. This is a universal type of gooseneck hitch. See and click the link for more product details and install guide (https://www.curtmfg.com/part/16055) and (https://assets.curtmfg.com/masterlibrary/16055/installsheet/16055_INS.pdf). If good. Grab our sale price offer and click the link below to order today. I hope this helps. Happy shopping. https://www.carparts.com/gooseneck-hitch/curt/cur16055?can=CPJE1043

Hi Ginger, This is a Curt 5th Wheel Rail goosenech hitch, usually for big heavy duty trucks not for a car. To look up the correct hitch for your car, please follow the steps below. To check the fitment please use our Vehicle Selector — which can be found towards the top of the homepage as well as all category, search results, and product pages — can help verify if a part will fit your specific application. To enter your application, simply select your vehicle’s year, make, model, sub-model, and engine type and click “Go.” Once your application is selected, you’ll see a “Guaranteed to Fit” badge if the part will fit, and we recommend that you also double-check Your Vehicle Fit Details as well as the Vehicle Fitment Information table on the product page.